Good for Kids!

The Youngest asked "If there's a remaining slices what is the measure of remaining slices in degrees?" the Elder said "I don't know!" The Youngest wants to know according what he asked. Can you help him to find the degrees of remaining slices of cakes?

Legendary : $\color{#BBBBBB}{\text{Dark chocolate}}$ is the color of cake then $\color{#624F41}{\text{brown}}$ is color of the plate to avoid confuse.